The shock-containing jet issued from a rectangular convergent nozzle with an aspect ratio of 4.0 at the exit is captured quantitatively by the rainbow schlieren tomography. Multiple viewing rainbow schlieren pictures of the jet are taken for a nozzle pressure ratio of 4.0 to produce a strong shock with a Mach stem in the jet plume. The convolution back-projection (CBP) method is utilized to reconstruct the three-dimensional density field of the jet. The flow topology of an intricate near-field shock system in the jet is displayed vividly by a bird's eye view representation of the isopycnic field with a high spatial resolution
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